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LFS 7.1 - Kernel Panic

Hello,
After rebooting on LFS system I got :

Code:

Kernel Panic

No file system could mount root



VFS: Unable to mount rootfs on unknown block (8.18)

I am not using grub from the book but the one already packaged with my distribution (OpenSUSE 12.1)

My HD configuration is :

sda1 /boot
sda2 / ->Opensuse
sda3 swap
sdb1 /data
sdb2 / -> LFS

here is my grub menu.lst

Code:

# Modified by YaST2. Last modification on Fri Jun  8 18:14:38 CEST 2012

# THIS FILE WILL BE PARTIALLY OVERWRITTEN by perl-Bootloader

# For the new kernel it try to figure out old parameters. In case we are not able to recognize it (e.g. change of flavor or strange install order ) it it use as fallback installation parameters from /etc/sysconfig/bootloader



default 0

timeout 8

##YaST - generic_mbr

##YaST - activate



###Don't change this comment - YaST2 identifier: Original name: linux###

title Desktop -- openSUSE 12.1 - 3.1.10-1.9

    root (hd0,0)

    kernel /vmlinuz-3.1.10-1.9-desktop root=/dev/disk/by-id/ata-Maxtor_6Y160M0_Y47RLKNE-part2 resume=/dev/disk/by-id/ata-Maxtor_6Y160M0_Y47RLKNE-part3 splash=silent quiet nomodeset showopts vga=0x31a

    initrd /initrd-3.1.10-1.9-desktop



###Don't change this comment - YaST2 identifier: Original name: failsafe###

title Failsafe -- openSUSE 12.1 - 3.1.10-1.9

    root (hd0,0)

    kernel /vmlinuz-3.1.10-1.9-desktop root=/dev/disk/by-id/ata-Maxtor_6Y160M0_Y47RLKNE-part2 showopts apm=off noresume edd=off powersaved=off nohz=off highres=off processor.max_cstate=1 nomodeset x11failsafe vga=0x31a

    initrd /initrd-3.1.10-1.9-desktop



title LFS 7.1

    root (hd0,0)

    kernel /boot/vmlinuz-3.2.6-lfs-7.1 root=/dev/sdb2 rootdelay=10 ro

Any idea?

Thanks

Fab

If you have your LFS kernel in that boot partition, then try removing /boot from the path in the kernel menu command. If the LFS kernel is not there, then the root menu command is wrong.

The kernel is located in the /boot partition
I modified menu.lst :

Code:

title LFS 7.1

    root (hd0,0)

    kernel /vmlinuz-3.2.6-lfs-7.1 root=/dev/sdb2 rootdelay=10 ro

There is no changes. It's still displaying the same errors.

I was thinking it may come from the ext4 support in the kernel. I am recompiling it with ext4 support.

Get rid of that rootdelay thing and try again.

Next, make sure that you built into the kernel the appropriate filesystem drivers. Without an initrd file, that kind of stuff has to be built in to be available.

It was built as a module.

I will recompile it as a part of the kernel.

Code:

cat boot/old/config-3.2.6 | grep EXT4

CONFIG_EXT4_FS=m

CONFIG_EXT4_USE_FOR_EXT23=y

CONFIG_EXT4_FS_XATTR=y

CONFIG_EXT4_FS_POSIX_ACL=y

CONFIG_EXT4_FS_SECURITY=y

CONFIG_EXT4_DEBUG=y

Thanks

Did you configure this option in your Kernel?

Code:

Device Drivers  --->

  Generic Driver Options  --->

    Maintain a devtmpfs filesystem to mount at /dev

Perfect !!! It's working

Thank you

Which suggestion fixed your issue?

Some features were missing in the kernel.
The ext4 support was built as a module and the devtmpfs options were not built at all.

Thanks a lot